Preventive maintenance is all great for the variable frequency drive, cleaning with dry air, checking connections and tightening with correct torque wenchdriver, replacing fan and having spare. Abbs extensive experience in drive maintenance means that we can optimize the service intervals according to the needs of different components and systems within your drives. Vfds are used to adjust a motors speed to closely match output requirements in industrial, hvac, waterwastewater treatment, machinery oem. The best applications for variable frequency drives vfds vfds can be applied to both. Pdf condensate pumps provide the motive force to deliver condensate from the hotwell to the deaerator storage tanks. Variable frequency drives vfd, aka variable speed drive vsd have been available for use with a wide range of applications for over 20 years. Inspection and maintenance of air filters may be required.
A variable frequency drive will control the speed of doubling machine according to the load variation and thus reduces power consumption. They match motor torque and speed to the load, saving energy when load requirements are reduced. By integrating a preventive maintenance vfd program, you can ensure your drives provide minimal repair service while maximizing production. Variable speed drives for synchronous and asynchronous motors programming manual 112014 s1a53838. An area that represents significant opportunity is the use of vfds to start and control motors. The powerxl dc1 compact variable frequency drive stands out with its small size and. Installed drives are maintained according to detailed product specific schedules. Weve produced a helpful bullet list of common causes of vfd failures, along with maintenance and repair. Regular preventive maintenance actions allow to control maintenance costs and to optimize life time performance. The ach550 is an adjustable frequency ac drive designed specifically for the hvac market. Speed control board and variable frequency drive vfd to automatically adjust the indoor fan motor speed in sequence with the units ventilation, cooling and heating operation. The acs 600 single and multidrive family includes drives from 3 hp to 4,000 hp and voltages from 230 to 690 v. Optional pc drive configuration software which runs on windows operating system is available. Typically, you can save 2050% of energy when using fans and pumps with variable speed drive.
The term variable frequency drives vfd is used interchangeably with ac drives, inverter, and adjustable frequency drive afd. Built in as standard are an extensive library of preprogrammed hvac application macros that, at the touch of a button, allow rapid configuration of inputs, outputs and parameters for. Variable frequency drives vfds in the 3 800 horsepower range. This sounds pretty basic, but the electronic guts of the operation are actually complicated and need consistent maintenance by qualified operators. Eaton s svx9000 adjustable frequency drive offers sensorless vector control technology coupled with an adaptive motor model and sophisticated asic circuit features. Depending on the ac variable frequency drive manufacturer, the switching frequencies of an ac drive ranges from a few kilohertz to as high as 30 khz. Circuit breakers feeding the vfds are recommended to be thermalmagnetic and fast acting. The maintenance course includes practical exercises on either a full training drive system or suitcase training drive system or mobile training center, depending on location and availability. In fact, just about every variable torque fan and pump application in the field today is running the vf control method. Ac motor, main drive controller assembly, and driveoperator interface 210211. Vfds function to adjust motor speed to better fulfill the requirements. Each part of a variable frequency drive has the following function. The crankshaft knowledge bank for more information on polyphase induction motors 15 vfd operation. Variable speed drive often uses less energy than an alternative fixed speed mode of operation.
It is designed for portability and powered using a standard. Most of the true rms handheld multimeters in the market have high ac bandwidth and are able to capture all the unwanted high frequency switching components generated by the ac drive. Ema regularly provides preventive maintenance on nearly all brands of ac drives, dc drives and controllers. Dc drives and motors dcs 500 and dcs 400 dc drives are available from 5 hp to 10,000 hp and voltages. The ac electric motor used in a vfd system is usually threephase induction motor.
Courses may also be delivered on board, using the customers drive equipment as available. This technology allows for steady speed error, fast torque rise time, high immunity to resonance vibrations and high starting torque and current. January 9, 2019 invitation to bid bl01719 variable. Browse variable frequency drives in the schneider electric catalog including atv61 variable frequency drive,atv12 variable frequency drive,atv312 variable frequency drive,atv32 variable frequency drive,atv71 variable frequency drive,atv212 variable f. Eatons svx variable frequency drive provides sensorless vector control for. For variable frequency drive in continuous operation, we take an external visual inspection for the vfd running state. To avoid fault during operation it is always better to perform preventive maintenance of variable frequency drive as per manufacturer recommendations. The altistart 01 soft start soft stop units combine simplicity and efficiency.
A variable frequency drive vfd is a type of motor controller that drives an electric motor by varying the frequency and voltage supplied to the electric motor. Variable frequency drive reliability application edge volume 1, issue 6 comparing reliability of medium voltage variable frequency drives vfds can be confusing. Variable frequency drives vfds popular speed control devices used in industrial, commercial and residential applications. Variable frequency drive vfd installation instructions input ac power 1. Table 1 recommended drives maintenance tasks and schedule powerflex 750series, 70, 700, 700s, dc 0 92 81 71 61 51 41 31 012321 4567811 s 01 r91 a e y. Type of drive variable voltage \ nvariable frequency drive with microprocessor based simplex full collective control. As an example, ac 480v, 60hz supply is applied to the vfd which varies the signal voltage and frequency to have control of the speed. Labvolt series by festo didactic variablefrequency drive. In two positions, the voltage is zero, ie, when all the phases are connected to the same dc bus, either negative or positive. A typical variable frequency drive vfd can have anywhere from a few hundred to well over a thousand parameters. Powerxl dc1 variable frequency drive overview eaton.
Reliability analysis of application of variable frequency drive on. Always call certified variable frequency drive integrators or experienced technicians to perform preventive maintenance vfd services to prevent injury or death. Other names for a vfd are variable speed drive, adjustable speed drive, adjustable frequency drive, ac drive, microdrive, and inverter. Tighten all nuts and bolts, all terminal blocks, cablewire connections. A variable frequency drives used in a drivesystem consisting of the following three mainsubsystems. Vfd variable frequency drive maintenance smith and long.
Failure modes effects analysis on combine effects from vfd on. Dc motors are used in precise speed control applications due to. Dec 15, 2015 the beauty of variable frequency drive vfd is that the maintenance is negligible if are well maintained. Knowing which ones to adjust and to what setting can be intimidating. Electronic speed controllers for ac motors usually convert the ac supply to dc using a rectifier, and then convert it back to a variable frequency, variable voltage ac supply using an inverter. Combine the energy savings the svx variable frequency drive with the following.
By integrating some simple, logical steps into your preventive maintenance pm program, you can ensure your drives provide years of troublefree service. Mediumvoltage drives abbs highly reliable acs is available from 400 hp to 6,700 hp and voltages of 2. Preventive maintenance vfd precision electric, inc. The cfw300 drive is a low cost vfd with high end features like a builtin plc, dynamic braking, fire mode, pid, 65,000a sccr, zero stack foot print, multispeed, etc and is even culus listed. Technical specification for variable frequency drives. The higher the switch frequency, the more resolution each pwm pulse contains. A variable frequency drive vfd controls the speed, torque, and direction of an ac motor. They are used for running an ac motor at variable speeds or let them ramp up their speed to.
Service bulletin, preventive maintenance checklist of. A variablefrequency drive is a device used in a drive system consisting of the following three main subsystems. Preventive maintenance maintenance for drives abb drive. The speed at which power devices switch on and off is the carrier frequency, also known as the switch frequency. This paper defines the key terms used in reliability comparisons and compares two reliability assessment methods commonly in use by vfd manufacturers. Smc mwc 8 construction of 09 nos of new model wome tender. Mechanical speed control 24 3 principles of operation ac vfd drives 25 a. The variable frequency drive shall be a clean power voltage source, advanced pulsewidth modulated, space vector technology motor controller which utilizes the latest igbt technology and surface mount construction to afford efficient use of available space, prudent energy consumption. Brief explaination about working of vfds, benefits and. An increase in speed response results in a faster motor response when the frequency reference is changed.
Variable frequency drive vfd installation instructions. Always call certified variable frequency drive integrators or experienced technicians to perform preventive maintenance vfd services to. Vfds can control anything from simple fans, pumps, and compressors, to elevators, cranes, or winders, saving money and precious resources. Ach550 low voltage ac drive hvac drive abb free bim. Variable frequency drive vfd troubleshooting and maintenance. I have workshop to maintenance and repair the variable frequency drive, after repairing the vfd must be tested and loaded to full load to ensure that the repair done 100%.
Variable frequency drive maintenance due to power electronics technology and microelectronics technology rapid development, variable frequency drive reforms and upgrades speed also is faster, introduce new products, improve performance continuously, enrich and strengthen function constantly. We also manufacture our systems to be lowmaintenance. Combine the small yet powerful powerxltm dc1 compact variable. Preventive maintenance checklist of industrial control and drive system equipment. Typical switch frequencies are 3,000 to 4,000 times per second 3khz to 4khz. Why buy a vfd mechanical, electrical, and fluid power adjustable speed drives are available that offer some of the aforementioned benefits. The best applications for vfds electrical engineering portal. While vfd controllers can be used with a range of applications, the ones that will produce the most significant benefits are those that require variable speed operation. As the frequency is decreased, the speed of the motor also decreases. The vfd area must be kept clean, dry and free of dust.
Speed response is defined as how well the vfd can respond to a change in the frequency reference. Eaton s variable frequency drives, also known as adjustable frequency drives, are designed and manufactured for applications requiring ultracompact solutions, clean power or future configurability in mind. When we carry out maintenance on your drives, we will take care of tasks predefined in product specific maintenance schedules. In variable speed applications, a dc motor may be operating in one or more modes. Such applications are pumps, fans, some types of conveyors, and similar applications. Variable speed drives and soft starters schneider electric global. See the basic principle with the singlephase ac as the simplest example. How to maintain a variable frequency drive johngierich 20181018t11.
Basic variable frequency drive maintenance tips as we have seen, increasing pressure to improve financial performance is driving a change in the way end users approach control of production, engineering, operations, and maintenance across the manufacturing enterprise. The basic configuration of a variable frequency drive is as follows. Home blog vfd maintenance figure out variable speed drives failures if there is frequent currentlimitation or overcurrent alarm during the variable speed drive running, we should check the loads and inverter igbt module is normal or not, if its good, then the failure is the hall magnetic compensation current sensor damaged on the control. Do you know how to maintain variable frequency drives vfds. Variable speed drives in lift systems article pdf available in elevator world 499. Generally, variable frequency drives vfds allow to operate motors and pumps at.
The new, patented, predictive maintenance models are built around a common framework where the amount of life consumed by each component is tracked by the drive. The above figure shows how the voltage and frequency are varied by a variable frequency drive. Variable frequency drives, theory, installation and maintenance. So i need to couple two ac motor to make the vfd loaded. Svx industrial variable frequency drives vfd eaton. Variable frequency drives vfds serve an important function in industry. An electronic converter which converts direct current dc to alternating current ac is known as an inverter.
Hvac power requirements for cooling the heated air rejected from the drive may be higher than the pumping power required for liquidcooled vfds. The beauty of variable frequency drive vfd is that the maintenance is negligible if are well maintained. A converter is a device to create the dc from the ac power supply. There are a lot of tradeoffs in the different designs and depending on the goals and preferences of the. The variable frequency drive training system is a stateoftheart training system specifically designed to introduce students to the basic principles of variable frequency drives vfds. Basic variable frequency drive maintenance tips vfd. Implementing advanced predictive maintenance functions. Power conditioner for variablefrequency drives in offshore oil. Variable frequency drives troubleshooting larry stanley, regional sales engineer, january 2014. While all variable frequency drives vfds control the speed of an ac induction motor by varying the motors supplied voltage and frequency of power, they all do not use the same designs in doing so.
Vfds are used in commercial and industrial settings where the climate of a large space needs to be controlled. Introduction in the united states 50% of the total electrical energy generated is consumed by rotating equipment. This means that your typical hvac fan or pump is running at 100% speed even when the environment of the building is calling for something less than 100% heating or cooling. Sep 17, 2014 by integrating a preventive maintenance vfd program, you can ensure your drives provide minimal repair service while maximizing production. Output on equipment such as pumps, fans, and blowers can be varied by changing motor speed or by using dampers and reducing valves with constant speed motors. The svx9000 is suitable for multiple motor drive systems and highspeed applications. Vhz if you decrease frequency, volts must decrease also to achieve constant torque volts 60 hz vhz volts 30hz 480 8. Mv7000 variable frequency drives maintenance course description. Electrical drive have become the most essential equipment now a days in the electrical motors and other rotating machines. These applications include single motor driven pumps, fans and compressors, as well as highly sophisticated multi drive machines. Variable frequency drives vfd is one of such methods which.
Pdf application of variable frequency drive on the condensate. Their engineers suggested installing variable frequency drives vfds on the wall fans of the newly installed air handler to maximize their energy savings. Lowest first cost takes precedence over life cycle cost that is, initial cost plus running and maintenance costs. Combine variable frequency and fixedspeed drives for. Advanced physicsoffailure models are incorporated into the drive to convert actual stressors e. Its easier than you might think, but its something you shouldnt take for granted. The vorecon is ideal for variable speed drive applications in power ranges from 1 to. Drive type and motor control algorithm will effect how a vfd trips on opl acs550 only trips in vector mode vfd faults. It provides a comprehensive, highquality, and costeffective solution to rapidly build student knowledge in vfds and their motor applications. Output frequency the vfd shall be capable of variable frequency, variable voltage output in the range 0 500hz and 0 supply voltage. In addition to speed control, the application of vfds results in process.
555 94 48 448 1549 556 1280 463 922 1314 1216 1027 633 763 1084 631 1110 1426 917 1074 865 1346 655 1224 672 1211 735 641 402 1356 206 1056 918 193 1475 836 1003 271 365 1260 229